Hrvatski jezicni portal is a Croatian dictionary database portal. In order to access it, search Hrvatski jezični portal - Znanje, and select the website http://hjp.znanje.hr/.
Goethe Language Tests is an online tests for beginning and advanced level Croatian language students.
Learn Croatian is a great resource if you're trying to learn Croatian you will find some useful resources including a course about adjectives, adverbs, articles, feminine, negation, nouns, numbers, phrases, plural, prepositions, pronouns, questions, verbs, vocabulary, exercises to help you with your Croatian grammar all this is free of charge.
Is there a difference between Croatian and Serbian beyond the alphabets? Take a look at this brief lecture by Branco Franoli of Trinity College, online here. The tables with comparative vocabulary give a brief overview on some of the differences between the languages.
G.L.O.S.S. or the Global Language Online Support System has some great materials to keep your language skills up to speed. There are radio reports, individual grammatical lessons on counting, dates, etc and much more. Many of the sections will introduce specialized vocabulary in areas such as politics, economics, etc.
One of the most complete and easy-to-use dictionaries on the web can be found here at the Hrvatski Jezicni Portal. In order to access it, search Hrvatski jezični portal - Znanje, and select the website http://hjp.znanje.hr/. The dictionary entire are very thorough with etymological information along with complete definitions, onomastics, etc. The dictionary boasts some 116, 506 basic words and has been drawn from the following works:
Wondering if your favorite English language novel has ever been translated? Index Translationum is one of the best sources for such information. You can search any number of fields - just author, title word, country of publication, translator, etc. You just need to specify the original language of publication and the language you are seeking to get a list of any and all translations. This was originally a printed publication and can be very helpful if you want to know if something was ever translated. The site, like its published version, is sponsored by UNESCO.